. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. 98 ECONOMIC ENTOMOLOGY DD. Abdomen without external lateral gills. E. Lower lip strong extensile and furnished with a pair of opposable hooks; abdomen terminated by 3 leaf-like tracheal gills, or vnth 5 spine-like appendages.— Odonata. EE. Lower lip not extensile and without hooks; caudal filaments and antennae long and slender; thorax with 3 pairs of tracheal gills.—Flecoptera. On account, however, of their common occ
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. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. 98 ECONOMIC ENTOMOLOGY DD. Abdomen without external lateral gills. E. Lower lip strong extensile and furnished with a pair of opposable hooks; abdomen terminated by 3 leaf-like tracheal gills, or vnth 5 spine-like appendages.— Odonata. EE. Lower lip not extensile and without hooks; caudal filaments and antennae long and slender; thorax with 3 pairs of tracheal gills.—Flecoptera. On account, however, of their common occurrence the economic entomologist should know a little at least regarding their habits and life-history. Stone-flies (Plecoptera).—The nymphs Hve under stones in swift streams, are flattish, and have tracheal gills, long legs, cerci and. Fig. 54.- -An adult stone-fly {Pteronarcys regalis). Folsotn). Slightly reduced. {After antennae. The adults are greyish and have prominent wings. The hind wings are the larger and when at rest are folded under the front ones. The larva; furnish food for fishes (Figs. 54 and 55). May-flies (Ephemerida).—May-flies arc well-known insects, being attracted to lights in immense numbers in early summer. They have large delicate wings and 2 or 3 long caudal filaments. The fore wings are much larger than the hind ones. The nymphs live at the bottoms of bodies of water, and have long legs, caudal filaments and prominent tracheal gills. They^mature in i to 3 years, and furnish abundant food for fishes.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Lochhead, William, 1864-1927. Philadelphia : Blakiston